CVE-2026-80747 (GCVE-0-2026-80747)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:26 – Updated: 2026-10-21 12:47
VLAI
Title
drm/amdkfd: Add bounds check for CRAT subtype length
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Add bounds check for CRAT subtype length The CRAT parser validates that the subtype header fits within the image, but does not verify that the advertised subtype length fits. A malformed CRAT table with an oversized length field causes out-of-bounds reads when kfd_parse_subtype() casts the header to specific subtype structures. Add validation that sub_type_hdr + length does not exceed the image boundary before parsing the subtype contents. (cherry picked from commit 48e1d1e6e8798aef0312e68d8e586021b5b3cf4d)
Severity
8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5b5c4e40a37e858e2bff8cd91be8e972256392c4 , < fef8c8afcb85dce5ff115f82a148cdf87a9617b9 (git)
Affected: 5b5c4e40a37e858e2bff8cd91be8e972256392c4 , < 77b659fb104eb069ea7a61960699e4d1eea6567a (git)
Affected: 5b5c4e40a37e858e2bff8cd91be8e972256392c4 , < 69164d6bdad5d6657e51436a3f602822f620a46a (git)
Affected: 5b5c4e40a37e858e2bff8cd91be8e972256392c4 , < ca91e0cc8087568e4b791648a7c01e804f48cb73 (git)
Affected: 5b5c4e40a37e858e2bff8cd91be8e972256392c4 , < 6e7566ba4739dd573c331adde1c96690f7a567bd (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_crat.c"
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "3.19",
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                {
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Add bounds check for CRAT subtype length\n\nThe CRAT parser validates that the subtype header fits within the image,\nbut does not verify that the advertised subtype length fits. A malformed\nCRAT table with an oversized length field causes out-of-bounds reads when\nkfd_parse_subtype() casts the header to specific subtype structures.\n\nAdd validation that sub_type_hdr + length does not exceed the image\nboundary before parsing the subtype contents.\n\n(cherry picked from commit 48e1d1e6e8798aef0312e68d8e586021b5b3cf4d)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable kfd_parse_crat_table() runs only during amdgpu/amdkfd bring-up (kfd_topology_init at module load and kfd_topology_add_device on GPU probe). On affected kernels, ACPI CRAT is copied from firmware via acpi_get_table(\"CRAT\"); there is no network, ioctl, or /dev/kfd path to this parser.\nAC:L - A malicious ACPI CRAT can set subtype length so only the 8-byte generic header fits in the remaining image while kfd_parse_subtype() casts to larger structs (cache, CU, iolink). The out-of-bounds read is deterministic at boot with no races or attacker-uncontrollable memory layout.\nPR:N - Exploitation requires only a crafted ACPI CRAT in platform firmware/UEFI parsed automatically at boot via kfd_create_crat_image_acpi(). No Linux user account, capability, or /dev/kfd access is needed; only control of firmware-supplied CRAT contents before KFD topology initialization.\nUI:N - CRAT parsing occurs automatically during kernel boot and amdgpu/KFD module initialization when topology is built. No user mount, file open, or other discretionary action is required beyond powering on hardware that contains the malicious ACPI table.\nS:U - Impact is confined to kernel heap out-of-bounds reads and corrupted topology metadata within the host kernel security domain. This is not a guest/host VM escape, container sandbox breakout, or IOMMU/DMA boundary bypass.\nC:H - kfd_parse_subtype() casts the generic header to large subtype structures and reads past the CRAT buffer boundary (e.g., cache sibling_map[32], iolink, computeunit fields). Leaked adjacent kernel heap bytes populate topology objects exposed via world-readable /sys/class/kfd/kfd/topology/ attributes (0444).\nI:L - Out-of-bounds read values (sizes, proximity domains, sibling maps, bandwidth fields) are stored into kmalloc\u0027d kernel topology structures (mem_props, cache_props, io_link_props), modifying kernel metadata with attacker-influenced data derived from reads past the allocation.\nA:H - Out-of-bounds reads during early init can dereference unmapped pages and trigger a kernel oops or panic during amdgpu/KFD bring-up. Related malformed-CRAT parser bugs at the same code path also cause infinite-loop denial of service, confirming high availability impact from CRAT parsing flaws."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:47:02.807Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fef8c8afcb85dce5ff115f82a148cdf87a9617b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/77b659fb104eb069ea7a61960699e4d1eea6567a"
        },
        {
          "url": "https://git.kernel.org/stable/c/69164d6bdad5d6657e51436a3f602822f620a46a"
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          "url": "https://git.kernel.org/stable/c/ca91e0cc8087568e4b791648a7c01e804f48cb73"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e7566ba4739dd573c331adde1c96690f7a567bd"
        }
      ],
      "title": "drm/amdkfd: Add bounds check for CRAT subtype length",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80747",
    "datePublished": "2026-09-03T08:26:28.938Z",
    "dateReserved": "2026-08-26T14:34:25.790Z",
    "dateUpdated": "2026-10-21T12:47:02.807Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-25",
      "epss": "0.00132",
      "percentile": "0.02773"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-80747",
      "id": "msrc_CVE-2026-80747",
      "initial_release_date": "2026-09-04T01:04:56.000Z",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/amdkfd: Add bounds check for CRAT subtype length",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80747.json",
      "version": "2"
    },
    "nvd": {
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                "product": "Linux",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Add bounds check for CRAT subtype length\n\nThe CRAT parser validates that the subtype header fits within the image,\nbut does not verify that the advertised subtype length fits. A malformed\nCRAT table with an oversized length field causes out-of-bounds reads when\nkfd_parse_subtype() casts the header to specific subtype structures.\n\nAdd validation that sub_type_hdr + length does not exceed the image\nboundary before parsing the subtype contents.\n\n(cherry picked from commit 48e1d1e6e8798aef0312e68d8e586021b5b3cf4d)"
          }
        ],
        "id": "CVE-2026-80747",
        "lastModified": "2026-10-21T13:19:59.607",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
                "version": "3.1"
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              "impactScore": 5.5,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-03T13:06:14.303",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T01:25:11Z",
      "cve": "CVE-2026-80747",
      "id": "CVE-2026-80747",
      "initial_release_date": "2026-09-07T16:20:17Z",
      "product_status:known_affected": "769",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "208",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80747",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-80747.json",
      "version": "10"
    }
  }
}



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